[FoRK] Breakthrogh in HDTV projector pricing

Eugen Leitl eugen at leitl.org
Wed Jul 21 14:33:40 PDT 2004


On Thu, Jul 22, 2004 at 05:28:05AM +0800, James Tauber wrote:

> As I discovered recently, adding more primaries doesn't buy you more
> colours because the parts of the chromaticity diagram outside a
> well-chosen triangle (that you could get to with a five-primary
> pentagon, for example) are indistinguishable to the human eye.

How abut primate tetrachromate mutants, though?
 
> Interestingly, what appears to us as the same colour would appear
> different to animals with different number of cones, however. Chickens
> would need 12 primary colours, for example.

Be careful whom you call chicken, human... we sort single photons by the
wavelenght bucket, spatially. Phear us.
 
> Furthemore, it only takes two colours to make white as long as the two
> colours and white are colinear on the chromaticity diagram.
> 
> Bunch of great info on the CIE diagram at:
> 
> http://hyperphysics.phy-astr.gsu.edu/hbase/vision/cie.html
> 

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a>
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